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Sat 17 of May, 2008 [00:53 UTC]

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  • Juan Ortega, Thu 15 of May, 2008 [10:33 UTC]: Hi everybody, I'm Juan, an ITCom student, and I need to know what basic elements I need to create a VoIP network. Can anybody helpme, please?,Thank you very much
  • gineta, Wed 14 of May, 2008 [03:58 UTC]: any here not fine the configuration of firewall juniper -screem for VOIP asterisk????
  • Anoop Prabhakaran, Tue 13 of May, 2008 [12:16 UTC]: I am developing Asterisk IVR, Whenever i make a internation call to the IVR system, the DTMF is not getting detected properly, this happens only for the first time, second call onwards system works fine. why this is happening
  • joe, Mon 12 of May, 2008 [04:27 UTC]: Is there an opensource browser based softphone, or a system like Busta where everything is not manages through their website?
  • Nick Barnes, Fri 09 of May, 2008 [11:36 UTC]: Christopher - yesterday I tried an Asterisk install on a CentOS 5.1 box with stock GUI and it all worked fine. Sorry I can't help.
  • aero, Fri 09 of May, 2008 [08:20 UTC]: can someone help me out on this, i tried to play some sound files on my asterisk box and this is the error message i got. WARNING[4429]: format_wav.c:169 check_header: Unexpected freqency 22050 May 8 11:17:39 WARNING[4433]: codec_gsm.c:194 gsmtolin_fra
  • Christopher Faust, Thu 08 of May, 2008 [14:15 UTC]: I beleive that I may have to change something in the xserver configuration. Please advise
  • Christopher Faust, Thu 08 of May, 2008 [14:14 UTC]: Everything was perfect. In the bios I have increased the memory allocated Still receive input not supported on my display.
  • Christopher Faust, Thu 08 of May, 2008 [14:13 UTC]: This would not be my main box. I am doing some testing to see if I can install zaptel and asterisk 1.4 on a full centos 5.1 box with development software Its bizzare, because before I went through the asterisk and zaptel installation everything was perfe
  • Nick Barnes, Thu 08 of May, 2008 [13:44 UTC]: Christopher - I can't see any way in which an Asterisk installation would muck your GUI, but remember that it is advised not to use a GUI on an Asterisk box anyway.
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VOIP and TTY

TTY (Teletype) and the later term TDD (Telecommunications Device for the Deaf) is a technology used by the hearing impaired to communicate over the phone. In the USA support of TTY is required in some public places (call centers, hotels, etc).

Asterisk has some basic Alpha level code (as of December 2006) with support for TTY.
There is some additional information available at tdd mode. Asterisk svn trunk
has support for T.140 realtime text and improvements on the TDD mode
in zaptel. TDD support is being developed in SIP too as well as a TDD gateway between
zaptel (analog devices) and SIP/T.140 realtime text in RTP.

See Also

Created by admin, Last modification by rkelley on Fri 15 of Feb, 2008 [14:26 UTC]

Comments

Comments Filter

ToIP ?

by GehirnJogging on Friday 25 of January, 2008 [16:00:18 UTC]
ToIP, never heard of thet one...

New Text-over-IP protocol

by Barry Dingle on Wednesday 31 of May, 2006 [02:28:50 UTC]
A new real-time Text protocol has been developed. It is often referred to as ToIP. It has been defined by the IETF in RFC 4103. It is very similar to VoIP as it uses the SIP control protocol and a Variation on the RTP protocol. It works on the ordinary Internet - that is, without added QoS - because it has built-in real-time error correction. A trial version of User Application that uses this ToIP protocol is called SIPcon1 and is available from SourceForge.net. Try a Google on SIPcon1. It works really well.
ToIP is designed to be part of the Voice/Video/Text-over-IP multi-play services that are being developed today. It is aimed at mainstream use with some features included to make it easier to interwork with TTYs text phones that operate on telephone networks.
TTYs were developed for analog telephone networks. ToIP was developed to use all the features of the Internet. /Barry

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